LTTng 0.165 for 2.6.31.5 : refactoring/cleanup

[Mathieu Desnoyers]

Hi,

I just finished testing the LTTng refactoring. It consists of:

- Change design to inheritance for channels and buffers.
  - Eliminate structure duplication for locking/allocation level of buffer and
    channel.
  - Remove now unnecessary krefs.
- Fix cpu hotplug for timers.
- Cleanups.

Impact:
- Cleaner code.
- Simpler structures for channel/buffers.
- Smaller d-cache footprint.

It also permits to change the license of all LTTng modules needed both
for kernel and user-space tracing to dual LGPL/GPL license.

Due to the size of this change, review and testing would be very
welcome. I decided to do it in a separate patch on top of the tree
rather than rebasing. Considering the size of this modification, going
over the modified code on a file by file basis rather than looking at
the patch itself is probably easier.

I decided to mark the "locked" and "irqoff" locking schemes as "BROKEN"
for now and focus on the lockless scheme. We could re-create them if
needed by deriving from the lockless code-base.

Thanks,

Mathieu

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Mathieu Desnoyers
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